ffbuild/common: silence DEPCXX output

Fixes: 0ce413af9cc8040095a6b714600d6a8dceaca514

Signed-off-by: Kacper Michajłow <kasper93@gmail.com>

ffbuild/common.mak

@@ -28,7 +28,7 @@ ifndef V
 Q      = @
 ECHO   = printf "$(1)\t%s\n" $(2)
 BRIEF  = CC CXX OBJCC HOSTCC HOSTLD AS X86ASM AR LD LDXX STRIP CP WINDRES NVCC BIN2C METALCC METALLIB
-SILENT = DEPCC DEPHOSTCC DEPAS DEPX86ASM RANLIB RM
+SILENT = DEPCC DEPCXX DEPHOSTCC DEPAS DEPX86ASM RANLIB RM
 
 MSG    = $@
 M      = @$(call ECHO,$(TAG),$@);